1 & 5 are just lounge area designations. The Air seats are reserved, so no matter which one you book it will be there when you return after taking a walk around the ship.
The only class distinction is that only Business Class ticket holders can enter the Business Class Lounge, inside up the front of the ferry.
The rest of the ferry anyone can walk around in, including the decks outside.
The numbered aircraft seating lounges vary depending on the individual ferry. Bluestar have various designs of ferry, so rather impossible.
It is only a relatively short journey so I would not worry about it.
On this short sailing you will probably want to spend most of your time out on the deck or in one of the cafes. If you still wants a reserved seat inside, any air-seat will do.
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